Yevent	= YAHOO.util.Event;
Ydom	= YAHOO.util.Dom;

newsletter = function(){
	return{
		init: function(){
			Yevent.onDOMReady(this.switch_to_form);
		},

		switch_to_form: function(){
			var button	= Ydom.get('news_button');
			var email	= Ydom.get('news_email');
			var frame	= Ydom.get('contentFrame');

			Yevent.on(button, 'click', function(){
				if(email.value == 'e-mailadres' || email.value == ''){
					alert('Gelieve uw e-mailadres in te geven.');
				}
				else{
					Ydom.setAttribute(frame, 'src', 'nieuwsbrief.php?email=' + email.value);
				}
			});
		}
	}
}();
newsletter.init();